Central lubrication unit



FIG. 1 is a top view of a central lubrication unit showing my newdesign;

FIG. 2 is a bottom view;

FIG. 3 is a front view, the rear being unornamented; and

FIG. 4 is a right side view thereof taken at a 90° angle.

The ornamental design for a central lubrication unit, substantially as shown and described. 